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Cornes Toyota
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Letters to the editor
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Wind power success story
OPINION
THE integration of wind energy
generation into the electricity grid
in South Australia is a success
story.
The gross statistic often quoted is
the total electricity produced as
a percentage of the supply. In the
year to June 2012, the electricity
generated by wind farms in SA
amounted to 3349GWh, or 26 per
cent of the total supply. This was
behind the 50 per cent supplied by
natural gas and ahead of coal’s 24
per cent.
Possibly more significantly,
the Australian Energy Market
Operator (AEMO) has revised
upwards the fraction of installed
wind generation capacity “firmly
available” to meet maximum
demand; that is, the amount that
can be counted on to be available
globally at any time regardless of
local intermittency. This amount
is up from 5.0 per cent to 8.3 per
cent for the summer period and
from 3.5 per cent to 7.5 per cent for
winter demand.
The reasons given for this upward
revision are twofold. There are
more wind farms operating in the
state, bringing with that greater
geographical diversity. As well,
the accuracy of the analysis of this
characteristic has been improved.
(Calculations are now based on
five-minute dispatch intervals
rather than a 30-minute time
scale. The previous method wasn’t
as accurate in measuring the
firmly available output.)
The final significant statistic is
publicly announced projects for
potential... ReaD MORe
John Boland/UniSa
A sad day for book lovers
Karin Nyfort-Hansen
I SUSPECT there are many others like me who remember
the era when Mary Martin’s bookshop upstairs in Da
Costa Arcade was about the only CBD business open on a
Sunday! Really, this is a sad day for Adelaide and all book
lovers.
Richard Brinkman
PEOPLE decry the loss of institutions like Mary Martin’s
bookshop and usually blame the internet. Then you ask
them when they last patronised Mary Martin’s.
We need iconic buildings
Kerry Seebohm
I AM a dedicated follower of the musings of the Lord
Mayor. As a resident of the western suburbs, I have no
right to comment on their decisions on... ReaD MORe